At a conference on the supernatural, one of the speakers asked, "Who here has ever seen a ghost?" 

Most of the hands go up. 

"And how many of you have had some form of interaction with a ghost?" 

About half the hands stay up.

"OK, now how many of you have had physical contact with a ghost?" 

Three hands stay up; there's a slight murmur in the crowd. 

"Gosh, that's pretty good. OK, have any of you ever, uh, been intimate with a ghost?" 

One hand stays up. 

The speaker blinks. "Gosh, sir, are you telling us that you've actually had sexual contact with a ghost?" 

The guy with his hand up suddenly blushes and says, "Oh, I'm sorry, I thought you said 'goat.'"